Dictionary.com
Thesaurus.com
Synonyms

landmark

American  
[land-mahrk] / ˈlændˌmɑrk /

noun

  1. a prominent or conspicuous object on land that serves as a guide, especially to ships at sea or to travelers on a road; a distinguishing landscape feature marking a site or location.

    The post office served as a landmark for locating the street to turn down.

  2. something used to mark the boundary of land.

  3. a building or other place that is of outstanding historical, aesthetic, or cultural importance, often declared as such and given a special status landmark designation, ordaining its preservation, by some authorizing organization.

  4. a significant or historic event, juncture, achievement, etc..

    The court decision stands as a landmark in constitutional law.
    Synonyms:
    benchmark, watershed, milestone

verb (used with object)

  1. to declare (a building, site, etc.) a landmark.

    a movement to landmark New York's older theaters.
landmark British  
/ ˈlændˌmɑːk /

noun

  1. a prominent or well-known object in or feature of a particular landscape

  2. an important or unique decision, event, fact, discovery, etc

  3. a boundary marker or signpost

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • unlandmarked adjective

Etymology

Origin of landmark

before 1000; Middle English; Old English landmearc. See land, mark 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

South Korean K-pop megastars BTS will kick off their world tour on Thursday, riding the momentum of a chart-topping comeback album and a landmark performance in the heart of Seoul.

From Barron's • Apr. 9, 2026

In March, Meta and YouTube were found liable in a landmark US trial over a woman's childhood addiction to social media.

From BBC • Apr. 8, 2026

But there’s a lot more to Meta than that product, including aggressive capital spending to keep up in the AI race and the loss of two landmark social-media addiction trials last month.

From The Wall Street Journal • Apr. 4, 2026

Finally, the hosts break down the WNBA’s landmark collective bargaining agreement and why Nobel laureate Claudia Goldin was the MVP of the negotiation.

From Slate • Apr. 4, 2026

The excavation at Cape Gelidonya was truly a landmark event.

From "Shipwrecked!" by Martin W. Sandler

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.